Variable-coil structure



Nov. 4, 1924. 1,514,322

A. A. KENT VARIABLE COIL STRUCTURE Filed Oct. 16 1923 4 Sheets-Sheet 1 INVENTOR.

MQMM BY Miflj fix ATTORNEY.

N 4, 1924. A A KENT 1,514,322

I I VARIABLE COIL STRUCTURE Filed Oct. 16, 1923 4 Sheets-Sheet 2 (9 A B 32 A fawm 3 F 1 33 gull]! 1 V a g; "M 2?, J2 411 M 15 m Y TWJ/ if; if 1 I u I I. WI, 2 16 m 2% f 7 Z 'lg 31 I! l x w? 25 yw @i 659 1 N VEN TOR.

-MMM

BY I mafflh ATTORNEY.

Nov. 4 1924- 7 1,514,322

A. A. KENT VARIABLE COIL STRUCTURE Filed Oct. 16, 1923 4 Sheets-Sheet 5 A TTORNEY.

Nov- 4 y A. A. KENT VARIABLE COIL STRUCTURE Filed Oct. 16. 1923 4 Sheets-Sheet 4 WWW mwi w A TTORNE Y.

cuitsemp oylng or F bearing or ournal supports,

- and co-action between I and for effecting friction sufiicient to retain Patented Nov..4, .1924.

ARTHUR A'IWATEB KENT, OF ABDMORE, PENNSYLVANIA.

VARIABLE-ch11. s'rncc'rnnn Application filed October 16, 1928. Serial No. 668,905.

To all whom it may concern;

Be it known'that I I, ARTHUR A'rwA-rnn KENT, ing at Ardmore, in the county of Montgomeryand State of Pennsylvania, have invented certain new and useful Improvements in Variable-Coil Structures, of which the following is a\specifica'tion.

. My invention relates to apparatus comprising relatively rotatable coils utilizable forany suitable purpose or in any desired way, but" artic'ularly as ayariometer or a .v'ario-cou er, or the like, in systems or cirtraversed by fluctuating or alternating current, and particularly high fre uency current such as used in systems of radio telephony, telegraphy and the like.

My. invention resides in apparatus of the character referredto compr sing a shaft,

divided into sections insulated prefer'abl I rom eac other, support ng 'coil structure," and co-acting the rotatable with suitable the shaft and supports bemg provided with means of the character, hereinafter described for effecting and maintaining good electrical contact shaft and supports the rotatable coil structure in any position to which adjusted.

Further in accordance with my invention, the stationary coil structure comprises coil suppfirts ofmolded insulating material havm 1 g them to supports and for accome modating binding posts or other connecting means.

Further in accordance with my invention, the rotatable coil structure comprises coil supports molded of insulating material secured toeach' other and to the shaft, and

preferably having integral closed ends.

Further in accordance with my invention, to one of the posts or supports, to whFch the statormembers are secured, is secured a panel, from the front of which the rotor shaft is operable and upon which is a scale; and iirthe case of ,the vario-coupler, the panel carries switches for varying) the inductanceoof the stator winding y large and small steps.

My invention resides in the features of construction and arrangement hereinafter described a citizen of the United States, residtegraltherewith extensions or lugs for securing This application is in part a continuation of my application Serial Number 564:,996, filed May 31, 1922. v

For an illustration of some of the various forms my invention may take, reference is to be had to the accompanying drawings, in which: i T

Fig. 1 is -a side'elevational view of apparatus embodying my invention.

Figs. 2 and 3 are elevational views at opposite ends of the structure of Fig. 1.

Fig. 4 is a longitudinal sectional View, some .parts in elevation, of the apparatus shown in Fig. 1. I} i Fig. 5 is a front elevational View of the structure shown in Fig. 1.

Fig. 6 is a fragmentary sectional View showing a modification of means for securmg said coil supports to each-other and to the shaft.

F.g. 7 is a fragmentary plan view of the structure shown in Fig. 6. i Fig. 8 is a vertical sectional view, arts in elevation, of a vario-coupler embo ying my nvention. I

Fig. 9 is a front elevational view of the structure shown in Fi 8. I Fig. 10 is a vertical sectional view taken on the line 10-10 of Fig. 8.

Fig. 11 is a fragmentary side elevation of the structure shown in Fig. 8. 5

Fig. 12' is a vertical sectional line 12-12 of Fig. 10.

Fig. 13 is a fragmentary sectional View indicating a modified mode of taking out the taps from the stator winding.

Fig. 14 is a, diagrammatlcview of one mode of utilizing the vario-coupler.

Referring to Figs. 1 to 5 inclusive, 1 and view on the 2are'substantially similarcoil supports of 1 contact with each other in the plane of the axis of rotation" of the metal shaft comprising the sections C and D, in axial alignment and secured to each other by the block or sleeve of insulating material 5, a washer or member 6 of insulating material separating the adjacentends of the shaft sections to insulate them from each other. The aforesaid coil supports 1 and 2 are cup-shaped in virtue of the fact that at their outer ends they are closed by the integral closure walls 7, preferably thinner than and offset from the outer face of the flanges 8 of the members 1 and 22 c The employment of the closure members 7 cheapens the molding operation in that it is simpler and cheaper to mold the members 1 and 2 with such walls or diaphragms 7, as'distinguished from the case .where the members 7 are absent, in which case the members 1 and 2 would have at 9, 9 circu-v lar apertures communicating with the interior of the assembly structure 1, 2.

The walls 7 have a further advantage-in that they form with the members 1 and 2 when assembled a substantially completely closed hollow structure, preventing access of moisture, dust, etc., to the interior of the members 1 and 2.

The members 1 and 2 are secured to each other by any suitable means, such, for example, as the bolts 10 having screw heads 11 received in depressions or countersinks in the flanges 8 and having threaded thereon at their opposite ends in similar depressions or countersinks in the flanges 8 the nuts 12. The bolts 10 are disposed adjacent, but on opposite sides of, the shaftstructure, tension-upon; the bolts as applied by the nuts 12 serving to clamp the coil supports 1 and 2 securely to the shaft and to hold the members 1 and 2 in fixed position with respect to each other as a unit rotatable with the shaft. The outer ends of the coils A and B are connected b the conductors 13 and 14, respectively, wit the shaft sections D and'C, respectively while the inner ends of the coils A .and B are connected to each other by the conductors'15 and 16 connected to each other at 17. Accordingly, the coils A and Bare in series with each other and the rotary coil unit" or rotor has-terminals in theshaft sections C and D. The direction of winding of the coils A and B or their mode of connection is preferably such that they operate cumulatively, as required in ordinary ractice. It will, of course, bezunderstood, iowever, that while the coils A and B areshown as connected in series with each other, they may be connected in parallel with each section C extends, preferably loosely. At

21 the member 18 has a conical, spherical or other similar counterbore in which engages the conical, spherical or similar end of the collar 22-secured upon the shaft section C adjacent or abutting against the adjoining edges of the coil supports 1 and 2.

In the support 19 the shaft section D has a relatively short bearing in the hole 23 in which the shaft section fits relatively snugly, the member 18 having the relatively larger bore 24 through which. the shaft D loosely extends. Secured by the screws 25 to the member 19 is the leaf spring 26 having an aperture.27 in which is received the conical end 28 of the shaft section D, the aperture 27 being relatively larger than the conical end 28, and the upper edge only of the aperture 27 engaging upon the conical surface 28. The spring 26 is so biased that 28 of shaft section D also presses the left end of the section D downwardly into good" bearing relation with the post 19 at 23, simultaneously eflecting a good electrical the post 19.

By the structure described, an accurate and substantial shaft mounting and structure' are provided, and at the same time low resistance electrical connections are made in effect between the terminals. of the coils A and B and the posts 18 and 19; and the action of the spring 26 serves also to eflect suflicient friction at the shaft bearings for ensuring that the rotatable coil structure will remain in, and not be easily displaced from, any position to which'it may be rotated upon rotation of the shaft sectionY'O by; the operator.

The movable coil structure comprising the aforesaid membersl; and 2 and the coils A and B carried thereby is rotatable within the stationary coil structure comprising the stator members 29 and 30, of molded insulating material, as bakelite, condensite, etc., and

each having the integral lugs orprojections 31 and 32 on opposite ends. The extensions 31 and 32 have faces preferably in substantially the same planes with the faces of the members 29 and at their sides of larger diameter. As indicated in Fig. 2, the exten sions or lugs 32, 32 on the members 29 and 30 lie on opposite sides of the post 19 and are secured thereto by the bolts or screws 33. imilarly, at the opposite ends the lugs or extensions 31, 31 upon the members 29 and 30 are disposed on opposite sides of the post 18 and are secured thereto by the bolts or screws 34. The inner surfaces of the coil supports 29 and 30 are of any suitable form, preferably spherical, as indicated, and concentric with the rotatable coil structure. Disposed upon the inner surfaces of the supp0rts'29 and 30 are the coils E and F, which may be of material and structure similar to the coils A and B. One terminal of the coil E, as that nearest the post 19, is connected thereto by the conductor 35 passing through a hole in the member 29 or its extension or lug 32 and held in electrical contact with the post 19 by the screw 36. The other terminal of the coil E is connected to the binding post 37 comprising a threaded rod or stud 38 molded in or threaded into the boss 39 integral with the member 29, the binding nut 37 being threaded upon the post 38, and a conductor 40 forming a part of the coil E or clamped by the nut 37.- Similarly, one terminal, of the coil F is connected by conductor 41 with thepost 18; the screw 42 holding. the conductor 41in engagement with post 18; and the outer'end of the coil F connects by conductor 43 with the binding post structure comprisingthethreaded rod 44, molded in or threaded into the boss 45 integral with the member 30, and the nut 46 threaded "upon the rod 44.

Accordingly, the bindin l p'osts37 and-46 constitute the two 'te'rmina s of the appararies with each ot er tus. From the binding post 37 the circuit or path extends through the. winding E to the post 19, thence through the shaft section D, thence through the inner or rotor coils A and B in series with each other, tothe 0st 18, and thence through thecdil F to the ,inding post 46. i

There is accordinglytion of stationa provided a combinaand-movable coils in seconstituting an indutit- 'ance, which is variable upon-rotation of the inner coil structure, for any suitable purpose,-part1cularly for changing the inductance of a highfrequency circuit such as used in radiotelephone, telegraph or other sys- The apparatus as described may be mounted in any suitable or desirable way. As indicated, the posts 18 and19 are provided with feet or pedestals 47 by which the structure may e secured to a horizontal, vertical or other s rface or member. Or when the apparatus is to be su ported upon a vertical board or panel, as or example, a vertical panel or switchboard of a rad1o receiving or transmitting apparatus, the post 18 may be provided with the threaded holes .48 ada ted to receive screws for holding the mem er 18 to the vertical board or panel, generally upon the rear thereof, the shaft section C being of sufficient length to extend to the front of the panel or board, and there provided with a handle or dial for turning the rotatable coil structure to predetermined or any desired position.

secured thereto the hub or sleeve 51 to which isattached the knob or handle 52 for rotat-.

ing the rotor with respect to the stator, the extent of movement of the rotor or the relative positions of the rotor and stator being indicated by the pointer 53 secured to the connected to a terminal thereof being Each of the members 1 and 2 adjacent its periphery at opposite ends is provided with a channel or depression 56, a bolt or screw 57' 'extendiii through the adjacent flanges of the mem ers 1 and 2 and clamping them toeach other. The wires of the coils A and B extend across or bridge the. relatively nar. row channels or grooves 56. The bolts or screws 57 clamp the members 1 and 2 to each other and to the shaft sections.

Referring to Figs. 8 to 12 inclusive, a structure in principle similar to that above described is disclosed. In this case, however, the rotatable coil structure is not connected to the stationary coil strutture, but is in inductive relation therewith, thestationary and movable coil structures comprising in effect the coils or windings of a high frequency'or oscillation transformer or variocoupler of which the outer coil structure or stator may be the primary, as when connected in the antenna path or circuit, while the rotatable coil structure or rotor may be the secondary which may be in a circuit attuned to the received oscillations and associated with suitable detector or wave responsive means.

In this case again the coils A and B are connected in series with each other, andthe terminals of the combination. are connected by conductors 13 and 14 to the shaft sections D and C, which in turn are in electri cal, communication with the posts 18 and 19, which may therefore be consideredterminals of th secondary of the coupler or transform er, 0 nections to the secondary circuit being made by conductors which may be held by the binding posts l8 and 19 to the posts 18 and 19, respectively.

Theprimary or stationary coil structure again comprises stator members 29 and 30. In this case, however, the coils E and F are disposed upon v the outside of the members 29 and 30 upon conical surfaces, though it is. understood that spherical or any other shaped surfaces may be employed.

As indicated in Fig. 14, the coils E and F may be connected in series witheach other between the antenna or receiving conductor R, or equivalent means, and the earth or counter-capacity G, and the rotor or sec- 'ondary A, B, may have its terminals 18 and 19 connected to any suitable receiving circuit, as for example to the grid circuit of an amplifying or detector tube of the audion type. Different amounts of the primary or stator winding E, F are brought into circuit for tuning purposes by the switches 58 and 59, the former havin a plurality of switch contacts 60 connecte by a group of taps or lead conductors 61 with suitable points upon the stator coilsE and F, and the latter having a plurality of switch contacts 62 connecte by a group oftaps or conductor leads'63 with a plurality of points upon a portion of the stator coil F The switch 58 efiects coarse adjustment and the switch 59 fine adjustment .of the number of turns brought into circuit, there being preferably a single turn or convolution of the winding F between contacts 62 and a plurality of turns of stator coils E and F between thecontacts 60.

As indicated in Fig. 9 the fine and coarse switches are disposed upon the panel P on" opposite sides of the vertical axis'of sym metry and preferably below the pointer and scale 54.

'The twoswitches are similar, and the description of one will sufiice for both. Referring more particularly to Fig. 12, the switch arm 68 is secured to and electrically connected with the metallic shaft 64 extending through and having a bearing in the limit the movements of the switch in opposite directions. Binding post screw 67, having aroughened head 68 is preferably molded in the panel P and projects to the rear thereof where there is threaded thereon the binding screw or nut 69 for switch 58 and 70 for the switch 59. Surrounding the screw 67 and electrically connected therewith is the connector spring 71 having a perforation through which the shaft 64 extends and disposed between the panel P and the collar 72 secured by screw 73 to the shaft 64, the spring 71 pressing toward the left on the collar 7 2, as viewed in Fig. 12, thereby holding the switch 58 firmly in engagement with taps or connector leads 61 and 63 extend for the most part directly from the exterior of the coils E and F to the studs 75, these taps may be otherwise disposed as indicateddn Fig. 13 which shows the taps or lead conductors 61 extending through holes 76 in the end flange 29 of stator member 29 to the interior of the stator member 29 and thence through holes 77 to the appropriate convolutions of the winding E. It will be under-. stood that the taps or lead conductors 63 may similarly extend through the end flange 30 of the stator member 30 to-the interior thereof and thence through holes to the appropriate conductors of the winding F.

What I claim is:

1. A variometer, vario-coupler or the like comprising hollow coil supports of molded insulating material, coils thereon, rotatable shaft structure, and means withinsaid coils and extending transversely of the axis of said shaft structure holding said hollow coil supports to each other and clamping them at their opposite ends to said shaft structure. 2. In apparatus of the character described, rotatable coil structure comprising hollow coil supports of molded insulating material having integral end closure walls coils on said supports, shaft structure, and means clamping said supports to each other and to said shaft structure.

3. Rotor structure for v ariometers, variocouplers and the like, comprising rotor coil supports of molded insulating material, a

shaft, an end wall on each of saidsupports closing one end thereof, said supports together forming a substantially closed casing, and means holding said supports to each other and clamping them to said shaft.

4. Rotor. structure for variometers, variocouplers and the like, comprising rotor coil supports of molded insulating material, a shaft, an end wall on each of said supports closing one .end. thereof, said supports togetherforming a substantially closed casing, and meanslextending from the exterior of one of said supports into said casing and co-acting with the other support to hold said supports to each other and to clamp them to said shaft.

terial,-a shaft, and a bolt extending trans- ,verselyof said shaft and clamping said sup ports at their opposite ends to said shaft 7 Rotor structure for vaiometers, variocouplers and the like, comprising rotor coil supports of molded insulating material, coils thereon, an inwardly extending end flange on each of said supports, a shaft, and means co-acting with said end flanges and extending through said supports Within said coils for clamping said supports to said shaft.

8. Rotor structure for variometers, variocouplers and the like, comprising hollow. rotor coil supports of molded insulating material having inwardly extending end flanges, a shaft, said flanges disposed extending transversely thereof for clamping said supports to said shaft.

9. Rotor structure for variometers, variocouplers and the like, comprising rotor coilsupp0rts,a shaft, means clamping said supports to said shaft, a bearing member .for said shaft, and a collar on said shaft external to the rotor and engaging said bearingmember.

10. Rotor structure for variometers, vario-couplers and the like, comprising rotor coil supports, a shaft, means clamping said supports to said shaft, a bearing member for said shaft, and a collar on said shaft external to therotor and having a conical end engaging in a countersink in said bearing member.

11. Rotor structure for variometers, vario-couplers and the like, comprising hollow rotor coil supports, a shaft, said supports having grooves at their opposite ends in their adjacent edges, and means drawing said supports to each other to cause the walls of said grooves to clamp said shaft at said opposite ends of said supports.

12. Rotor structure for variometers, vario-couplers and the like, comprising hol- .tions, and connections and a bolt co-acting with adjacent said shaft and low rotor coil supports, coils thereon, shaft structure, means engaging'said supports and extending therethrough and within said coils to clamp them to said shaft structure, said supports having at their adjacent edges co-acting lugs and depressions for predetermining the positions of said supports with respect to each other.

13. Rotor structure for var'iometers, vario-couplers and the like, comprising rotor coil supports, a shaft, a shaft supporting member, a collar on said shaft external to the rotor, and resilient means exerting a force longitudinally of said shaft and thrusting said collar againstsaid shaft supporting member. s .i

14. In apparatus of the character described, rotatable coil structure comprising coil supports of molded insulating material,

coils thereon, shaft structure, and means holding said supports to each other and clamping them to said shaft structure, said shaft structure comprising shaft sections terminating within said supports, an insulating member coupling said shaft secfrom said coils to said shaftsections.

15. In apparatus of the character described, rotatable coil structure comprising hollow coil supports of molded insulating material having integral end walls, coils on said supports, shaft structure, and means clamping said supports to each other and to said shaft structure, saids aft structure comprising shaft sections terminating within said supports, an insulating member coupling said shaft sections, and connections fro u said coils to said shaft sections.

16. In apparatus of the character described, the combination with rotatable coil structure comprising a rotatable support, of a coil thei eon, shaft structure, a connection from said coil to said shaft structure, a conducting shaft support through which said shaft structure freely extends and having a conical seat, a conical member on said shaft structure engaging in said seat and electrically connecting said shaft structure to said support, and means for thrusting said shaft structure toward said seat.

17. A variometer, vario-coupler or the like, comprising stator coil supports, a bearing member between said supports and to which said supports are secured, a rotor comprising rotor coil supports, ashaft, means-clamping said rotor coil supports to said shaft, and a collar on said shaft external to the rotor engaging said bearing member. f

18. A variometer, vario-coupler or the like, comprising a pair of pedestals, a post upstanding from each of said pedestals, stator winding supports secured at their opposite. ends to said posts on opposite sides thereof, rotor structure,

and means providing bearings for said rotor structure on said posts. v

19. A variometer, vario-couple'r or the like, comprising a rotor, shaft structure carrying said rotor, a shaft support providing a bearing for said shaft structure, a second structure and thrusting it against said second bearing member, and a winding on said rotatable coil structure, said shaft structure comprising mechanically coupled shaft sec ti-ons insulated from each other and connected to said winding, said shaft sections connecting said winding with said support and second bearing member,

21. A variometer, vario-ccupler or the like, comprising the combination with rotatable coil. structure, of shaft structure therefor, a shaft support providing a hearing for said shaft structure, a second bearing member, said shaft structure having a tapered surface,-and means engaging said tapered surface forcing said shaft structure against the bearing in said support Y and thrusting the shaft structure longitudinally against said second bearing member.

22. A variometer, vario-coupler or the like, comprising the combination with rotatable coil structure, of shaft structufe therefor, a shaft'support providing a bearing for said shaft structure, a second bearing member, said shaft structure having a tapered end, and,a spring having an aperture receiving said tapered end, said spring and said aperture engaging said tapered .end to force said shaft structure against said bearing in said support and thrusting said shaft structure longitudinally against said second bearing member.

23. A variometer, vario-coupler or the like, com rising the combination with rotatable coil structure comprising a rotatable coil support and a winding thereon, of shaft structure comprising shaft sections insulated from each other and connected to said winding, conducting supports for said shaft structure, one of said support-s having a thrust bearing for one 0 said shaft sec-. tions, the other of said supports having a lateral bearing for the, other shaft section, and means engaging said other shaft section and thrusting said shaft structure longitudinally.

24.'A variometer, vario-coupler or the like, com rising the combination with rotatable coi structure comprising a rotatable coil support and a winding thereon, of shaft structure comprising shaft sections insulated from each other and connected to said winding, conducting supports for said shaft structure, one of said supports having a thrust bearing for one of said shaft sections, the other of said supports having a lateral bearing for the other shaft section, and means engaging said other shaft sec tion and thrusting said shaft structure 7 longitudinally and laterally against said bearing in said other support.

25. A varlometer, vario-coupler or the like, comprising the combination with rotatable coil structure comprising a rotatable 50 coil support and a winding thereon, of shaft structure carrying said rotatable coil support, shaft supports for said shaft structure,

a collar on said'shaft,,and a spring on one of said shaft supports engaging said shaft like, comprising rotor and stator structures,

said stator structure comprising winding supports having inwardly extending end flanges, a winding on each of said stator supports, and connections to said windings extending through said supports to the interiors thereof and thence outwardly through said flanges.

"27. A variometer, vario-coupler or the like, comprising a rotor, posts supporting said rotor, means for securing said posts to a support, stator members securedto' opposite sides of said posts, a panel secured to one of said posts and carried thereby free of said support, means attached to said rotor and disposed on the'outside of said panel for actuating said rotor, and rotor positionindicating members carried by said means and said panel.

28. A variometer, vario-coupler or the like, comprising a rotor, posts supporting said rotor, stator members secured to -opposite sides of said posts, a panel secured tov one of said posts, means attached to said rotor and disposed on the outside ofsaid panel for, actuating said rotor, and means independent of said panel carried by said posts for mounting said panel and said rotor and stator structure. I

29. A variometer, vario-coupler or the like, comprising a rotor, posts supporting said rotor, stator members secured to opposite. sides of said posts, a panel of molded insulating material, boss structure integral with said panel and engaging one of said posts, means securing said panel to said one of said posts, and means attached to said rotor and disposed on the outside of sa.-l panel for actuating said rotor.'

30. A variometer, vario-coupler of the like, comprising a rotor, posts supporting said rotor, stator memberssecured to opposite sides of said posts, apanel of molded insulating material, boss structure integral with said panel and engaging one of said posts, means extending through said boss structure securing said panel to said one of said posts, and means attached-to said rotor and disposed on the outside of said panel for actuating said rotor.

31. A vario-coupler or the like, comprising a rotor, posts supporting said rotor, stator members secured to said posts and carrying the stator winding, taps connecting at intervals with said winding, a panel secured to and supported solely by one of said posts, switching mechanism carried 'by said panel and comprising a plurality of contacts connected w1th saidtaps, and a movable switch member carried by said panel and co-acting with said contacts.

32. A vario-coupler or the like, comprising a rotor, posts supporting said rotor, stator members secured to said posts and carrying the stator winding, taps "connecting at intervals with said winding, a panel se-' cured to one of said posts, switching mechanism carried by said panel and comprising a plurality of contacts connected with said taps, a movable switch member carried by said panel and co-acting with said contacts, and means independent of said panel carried b said posts for supporting said panel and tii e rotor and stator.

33. A vario-coupler or the like comprising a rotor, posts supporting said rotor, stator members secured to said posts and carrying the stator winding, taps connecting at intervals with said winding, a panel secured to one of said posts, and a plurality 0t switching mechanisms carried by said panel and each comprising a movable switch memberand a plurality of contacts connected with said taps, said switches located on opposite sides of the axis or rotation of said rotor.

34. A vario-coupler or the like, comprising a rotor, posts supporting said rotor, stator members secured to said posts and carrying the stator winding, taps connecting at intervals with said wmding, a panel secured to one of said posts, a plurality of switching mechanisms carried by said panel and each comprising a movable switch member and a plurality of contacts connected with said taps, and rotor position-indicating means comprising a member attached to said rotor and means carried by said panel, said switches being disposed on opposite sides of and below said member attached to said rotor.

35. A vario-coupler or the like, comprising a rotor, posts supporting said rotor, stator members secured to said posts and carrying the stator winding, taps connecting at intervals with Said winding, .a panel seposts,

cured to one of said posts, switching mechanism carried by said panel and comprising a plurality of contacts connected with said taps, a movable switch member carried by and rotatable with respect to said panel and co-acting with said contacts, a binding post carried by said panel, and a member connecting said binding post with said switch .member and biasing it against said contacts.

36. A vario-coupler or the like, comprising a rotor, posts supporting said rotor, the

lterminals'of the rotor winding connecting,

respectiyely, with said posts, rotor circuit binding posts carried by said posts, a stator carried by said posts, taps connecting at intervals with the stator winding, a panel secured to one of said posts, switching mechanism carried by said panel and comprising a plurality of contacts connected with said taps and co-acting movable contact mechanism, and stator circuit blndmg posts carried by said paneland at least one of them connected with said movable contact mechanism 37. A vario-coupler or the like, comprising a rotor, posts supporting said rotor, stator, members secured to said posts and carrying the stator winding, taps connecting at intervals with said winding, a panel secured to one of said posts, switching mechanism carried by said panel and comprising a plurality of contacts connected with said taps, a movable switch member carried by said panel and co-acting with said contacts,

'and means integral with said panel for limiting the movement of said switch member.

38. A vario-coupler or the like, comprising a rotor, posts supporting said rotorl' stator members secured to said posts and carrying the stator winding, taps connecting at intervals with said winding, a' panel of molded insulating material, boss structure integral with said panel engaging one of said posts, means securing said panel to said one of said posts, switching mechanism ,carried by said panel and comprising a plurality of contacts connected with said taps, a movable switch member carried by said panel and co-acting with said contacts, and

means integral with saidpanel for limiting the movement of said switch member.

39. A variometer, vario-coupler or the like comprising a rotor, posts supporting said rotor, stator members secured to said a panel secured to one of said posts,

and means independent of said panel for securing said posts to a support for mounting said panel, rotor and stator members as a unit.

40. A variometer, vario-coupler or the like 1 comprising a rotor, posts supporting said rotor, stator members secured to said posts, a panel of molded insulating material, boss structure integral with said panel and engaging one of said posts, means securing said panel to said one of said posts, and means. independent of said panel for securing said posts to a support for mounting said pane rotor and stator members as a unit.

41. A variometer, vario-c'oupler or the like comprising hollow rotor coil supports of molded insulating material, coils thereon,

I haft sections.

421A. variometer, vario-coupler or the like comprising hollow coil supports of molded insulating material, coils thereon, shaft structure comprising co-axial shaft sections, inwardly extending flanges integral with said supports, and means withi Said coils engaging said flanges and extending through the chamber formed by said supports transversely to the axis of said shaft structure for clamping said supports at their opposite ends to the different shaft sections.

43. A variometer, vario-coupler or the like comprising a pair of conducting members, stator shells of molded insulating material secured at their opposite ends to said members on opposite sides thereof, rotor coil supports of molded insulating material disposed within said shells, co-axialmetallic shaft sections bearing, respectively, in saidc'onductin members and electrically connecting t erewlth, means clamplng said rotor coil supports to said shaft sections, and a rotor winding havin terminals electrically connected, respectively, with said conducting members through said shaft sections.

tions extending beyond said lugs for supporting said device.

45. In apparatus of the character described, a stator member, a rotor mounted within said stator member, and carrying a rotor winding, said stator member comprising two parts carrying windings and each having lugs on a plurality of sides thereof, the respective lugs on the two parts of "said stator member being opposed to each other, and blocks disposed between said lugs and having portions extending beyond said lugs for supporting said apparatus.

46. In a device of the character described. a shell formed in two parts, each provided with an internal winding, the two parts of said shellhaving on a plurality of sides thereof opposed lugs, blocks mounted be, tween said lugs and provided with enlarged end portions to form supports for said shell, and a rotor mounted within said shell and provided with external windings.

Jr-7.111 apparatus of the character described, rotatable coil structure comprising hollow coil supports of molded insulating material having integral end walls, coils on said supports, shaft structure, and means clamping said supports to each other and t said shaft structure.

ARTHUR ATWATER KENT. 

